> I changed the screen mode back to 5k as when its in the tk mode

Can you explain what you mean there?

> Should I try adjust the file with the resolution for the screen ?5120
x 1440 (32:9)

Yes it's worth a try. Although drm_info isn't listing 5K as supported by
the kernel, the kernel might also change its mind when maxbpc is
reduced. Please also try with <maxbpc>6</maxbpc>. If that doesn't work
then the only remaining options are:

* Try the latest graphics test kernel
(https://kernel.ubuntu.com/mainline/drm-tip/current/amd64/) and if the
bug still occurs then it's time to report an upstream bug at
https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/

* Replace the USB-C cable.

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https://bugs.launchpad.net/bugs/2077766

Title:
  [i915] Dell Ultrasharp 4919DW only achieves half of native resolution

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